An Image of a tree can be used to make look like many different things one of which being the insides of human lungs.
This image is simply half a tree turned upside down duplicated and put back to back. The outcome of this being an image which looks like a human lung.

]]>https://stefansikorski.wordpress.com/2013/01/15/tree-as-lungs/feed/0stefansikorskiTree as Lungs